Storable crosslinkable organopolysiloxane molding compositions

Abstract

In a plastic organosiloxane molding composition which in the absence of water is capable of being stored and in the presence of moisture is cross-linked to a rubber, the composition comprising a hydroxypolydiorganosiloxane, a nitrogen base and heavy metal compound as cross-linking catalyst, and a cross-linking agent, the improvement which comprises employing as the cross-linking agent a compound of the formula ##STR1## or a partial hydrolysis product thereof, wherein R is an optionally substituted alkyl, alkenyl or aryl group, R 1 is hydrogen or R, R 2 is an acyl, carbalkoxy or carbaroxy group or R 1 , a is 1-3, and n is 0, 1 or 2 and a+n≦3. Upon curing no unpleasant odors are given off upon decomposition of the cross-linking agent.

We claim: 
     
       1. In a plastic organosiloxane molding composition which in the absence of water is capable of being stored and in the presence of moisture is cross-linked to a rubber, the composition comprising a hydroxypolydiorganosiloxane, a base and heavy metal compound as cross-linking catalyst, and a cross-linking agent, the improvement which comprises employing as the cross-linking agent a silane compound of the formula ##STR4## or a partial hydrolysis product thereof, wherein R is an optionally substituted alkyl, alkenyl or aryl group, R 1  is hydrogen or R,   R 2  is an acyl, carbalkoxy or carbaroxy group or R 1 ,   a is 1-3,   n is 0, 1 or 2, and   a+n≦3.   
     
     
       2. A composition according to claim 1, wherein R is methyl or ethyl,   R 1  is hydrogen or methyl, and   R 2  is hydrogen, methyl or carbalkoxy.   
     
     
       3. In the preparation of a rubber by exposing to moisture a plastic organosiloxane composition, the improvement which comprises employing as said composition a composition according to claim 1.